EPA Method 525 - Internal Standard Back Catalog number: 30031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682621 Dibutyl sebacate, 1000mg Price on request 1489.22-50-ME Pyrenyl-1-O-glucuronide, 50µg/mL, Solvent-methanol, Unit 50µg, # of units-1, Cas.no. 15417-05-2 Price on request 96507 Norbuprenorphine Price on request